This pack consists of various icons design specifically for similar purposes. These purposes would include dark spells, certain types of summoning spells and abilities. Also useful in vampires or werewolf games.
They look okay, and might be useful, but none of them are anything particular. The Moon icon's glow looks kind of bad, should really smooth it out.
The eagle one has a bit of odd background.
The other ones have a pretty nice background, could use some more contrast, but looks okay. The silouttes doesn't look very WC3-ish, but they look nice